Looking for a brave wiring expert to help with wiring

I mean an inexpensive universal harness is only 150 bucks

With the amount of ability and smarts on this board and the demand for this product, I am surprised that no one has actually built for retail a wiring harness for classic MOPARS. The universal harnesses seem painful to build and there doesn't seem to be a company wanting to fill this void.

Regardless, my harness is workable. My time is free. Some of the abortions I thought were caused by the PO are actually "factory done". But I need help.

I have identified 95% of the connectors....and I am making changes like orange box ignition, using none of the mopar gauges, getting rid of the ballast via a coil and making the pollution control disappear. This should have an impact on the wiring.

I also have questions like the ERG reminder lamp wire leaves the firewall and is joined in a two part connector (exhaust gas recirculation maintenance lamp switch) that also houses a black wire. This black wire connects with a single connector (not sure what it is for) then continues to meet (joined) with 6 other black wires in an octopus..




Is this black a ground ? So even though i don't use the ERG thingy anymore, I cannot cut it our however, can I simplify this and cut out this plug (exhaust gas recirculation maintenance lamp switch) and joining the two colour wires together ?

AND

The plug that plugged into my old ignition box has different colour wired that the plug that will be plugging into my new orange box. Since there is a discrepancy in colours, do I cut the harness and wire in the new plug based on location ?

Thanks
Ian.